Fire-resisting paint



l f lt all NEVIL ION'BOE HOPKINS, OF l'il'llfilf YORK, 1'.

iii"? 1 lib/L ented Sept. 2, 1924.

' so STATES UNIT ssuer PBOOFING PRODUCTS, INC A OORPOBQTION OF NEW YOBI.

' FIBE-BEBIBTING PAINT. 7

so Drawin Application filed April 4, ma,

following is a specification.

The present invention relates to novel methods of fireproofing combustible substances such as wood, mill-board, pasteboard, straw-board, and other porous or partially porous inflammable or combustible substances, through the agency of an externally applied coat of impregnating, or semiimpregnating, fire resisting water vehicle paint.

I find that a valuable combination, impregnating or semi-im regnating, and fire resisting water vehic e paint, may be cheaply and economically made by using a water solution of sodium silicate and sodium fluoride round into a paint paste or cream of consi erable hiding power by the addition of substances such as finely divided asbestos, asbestine a pure fibrous silicate of magnesia, kaolin and zinc oxide, or a mixture of such substances, colored by the addition of such pi ments as French ocher, Venetian red, oxi e of iron, lamp black, etc.

Although the pro ortions of the substances may be somew at varied to meet difierent conditions, the following formula is typical of the best:

B1.50 pints sodium silicate solution 41.6

-.50 pint wgter.

4 oz. sodiiim fluoride.

6 oz, asbestine.

6 oz. ground asbestos.

2 oz. of yellow ocher or any other pigment sufiicient to color.

I find that a mixture of such substances when suitab device for intimate incorporation, produces a creamy paint like substance, which imparts a highly valuable tire resisting property to porous, or partially porous, combustible substances, as the surfaces of such substances mentioned by virtue of the porosity, cause them to act like a filter, admitting the water, together with the sub stances in true chemical solution, namely the sodium silicate and the sodium fluoride but arresting and confining to the surface ground through a paint mill or other.

mm at. 049,545. Renewed January. :1, 924.

the substances merely in mechanical suspen; sion, the asbestos, asbestine, kaolin, zinc oxide and the coloring pigment, together with a certain superziuity' of the binding sodium silicate.

Such a water vehicle paint strikes into the surface of the material to be protected, with the filter action as described, impre nating' the substance to be fireproofed wit a highly fire resisting substance or substances, end also coverm of the material to be re roofed, with a layer of a substance or su stances of fire resisting material and of low heat conductmg value.

find that a permanent, smooth and reliable locked on surface paint results from the im regnation, drying, setting and hardening 0 this combination of substances, both within the ores and upon the surface of the pores of tii the outer surface 5 1 stARtH ROOM- PATENT. 0mmz, nasronoa so one aoano'r sma- '75 e material to be protected,

for interior work where it is not subject to tion, consisting of the mixture of sodium silicate, fluoride, asbestos, zinc oxide and kaolin, or any mixture of these substances, colored by any suitable pigment, I secure the fireproofing element, or a suitable combined fireproofing and decorative paint for indoor work.

I may, of course, elect to treat the surface of a combustible substance with one coat of the water ground solution and emulsion mixture as above described, or I may elect to apply oneor more coats of the said water round paint, and I may super-impose t ereon one or more coats of standard linseed oil white lead paint or especially proposed paint for the purpose, and I may in addition apply a coat or more of varnish, or I may elect to apply one or more coats ,of the water solution emulsion composition as hereinbefore described and elect to protect the same from the action of: the elements with one or more coats of shellac. I may elect to leave the shellac finish or I may varnish, or aint on top of the shellac.

Having ascribed my invention, I claim:

1. A fire resisting or fire retarding paint consisting of a water solution of sodium silicate, and sodium fluoride ground into a admixed with kaolin, zinc oxide and a. colkaolin, and zinc oxide to increase the hiding oring igment. I power of the paint and sufficient coloring l0 2. T e herein described new paint commatter to provide a predetermined color position consistng of a. water solution of thereto.

6 sodium silicate in the proportions of one and Signed at New York city, in the county of one half pints; sodium fluoride one half New York and State of New York, this third pint; 6 ounces finely divided asbestos and day of April, A. D. 1922.

6 ounces asbestine admixed with sufiicient NEVIL MONROE HOPKINS. 

